Natural Hydraulic Lime mortars are being used for the restoration of Canada’s historic Parliament Buildings. This is one of Canada’s largest restoration projects. Construction first started in 1860, and now consists of several buildings. The restoration project first started in 2002 and is now … [Continue Reading]

This masterpiece of XVII century French architecture was nearly destroyed by fire in 1994. Its complete restoration and reconstruction lasted three years, using Saint Astier Natural Hydraulic Lime in all phases of masonry, plaster and render.
{Photo by Eusebius (Guillaume Piolle). Licensed … [Continue Reading]

Pont du Gard (Bridge over the Gard River) is a monumental bridge-aqueduct built by the Romans during the first century and is part of the UNESCO World Heritage. It was part of a 30-mile long aqueduct with a remarkable constant slope of 15 inches per mile. The bridge was built without mortar and with … [Continue Reading]

Built by Napoleon the First to commemorate his victories, this monument was completed by King Louis-Philippe. This French landmark went through extensive restoration and maintenance using Saint Astier Natural Hydraulic Limes. … [Continue Reading]

NHL 3.5 was used for repointing the brickwork on Fire Station #44 in San Francisco, California.
Repointing Work and photos by Thameside Masonry … [Continue Reading]

St. Astier Natural Hydraulic Lime

Natural Hydraulic Lime (NHL) has been produced in Saint Astier since 30 BC and produced on an industrial scale since 1851. This time-honored product is enjoying a modern comeback due to its performance and beauty. Not only is natural hydraulic lime an important material in historical preservation and restoration of many buildings worldwide, St. Astier Natural Hydraulic Lime is also the safest and most natural green building product in the construction industry today.

Building With Hemp & Hempcrete

Hemp Construction, or Hempcrete, is much like concrete and is used mostly to form insulating walls. St. Astier Natural Hydraulic Lime's hemp construction product is called Batichanvre. It is mixed with strands of hemp to produce a lightweight, well insulating material. Forms are … [Read More...]

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About Us

TransMineral, USA was established in 1997 by Michel Couvreux, an architect in France and the U.S. His familiarity with traditional “old world” building techniques and materials have been instrumental in their revitalization in the U.S. along with his stewardship of implanting St. Astier Natural Hydraulic Lime in the North American building sector.